16719987 has 8 divisors (see below), whose sum is σ = 22523536. Its totient is φ = 11031552.

The previous prime is 16719973. The next prime is 16720007. The reversal of 16719987 is 78991761.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16719987 - 2¹⁰ = 16718963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16719907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28438 + ... + 29019.

It is an arithmetic number, because the mean of its divisors is an integer number (2815442).

Almost surely, 2^16719987 is an apocalyptic number.

16719987 is a deficient number, since it is larger than the sum of its proper divisors (5803549).

16719987 is an equidigital number, since it uses as much as digits as its factorization.

16719987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57557.

The product of its digits is 190512, while the sum is 48.

The square root of 16719987 is about 4089.0080704249. The cubic root of 16719987 is about 255.7085866539.

The spelling of 16719987 in words is "sixteen million, seven hundred nineteen thousand, nine hundred eighty-seven".